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首页> 外文期刊>Image Processing, IET >Incorporating approximate rotational invariance into two-dimensional S-transform
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Incorporating approximate rotational invariance into two-dimensional S-transform

机译:将近似旋转不变性纳入二维S变换

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摘要

The discrete two-dimensional (2D) S-transform (ST-2D) is a space-frequency representation that provides the local spectrum at each pixel in an image. The inherent localisation properties of the ST-2D make it a preferred candidate for space-frequency analysis. However, the ST-2D is sensitive to the image rotation. This limits its use in many image processing applications such as texture analysis. This study describes the rotational sensitivity of the ST-2D, and explains how this limits its application. To overcome these problems, a novel rotationally invariant S-transform (RIST) is formulated, and its rotational invariance is investigated. The RIST can provide approximate rotational invariance for magnitudes and complex values over a wide range of rotation angles, but with a trade-off of higher computation time. The RIST may be useful for many medical, scientific and industrial applications.
机译:离散二维(2D)S变换(ST-2D)是一种空频表示,可在图像中的每个像素处提供局部光谱。 ST-2D固有的定位特性使其成为时空分析的首选。但是,ST-2D对图像旋转敏感。这限制了它在许多图像处理应用程序(例如纹理分析)中的使用。这项研究描述了ST-2D的旋转灵敏度,并解释了它如何限制其应用。为了克服这些问题,提出了一种新颖的旋转不变S变换(RIST),并研究了其旋转不变性。 RIST可以在很宽的旋转角度范围内为幅度和复数值提供近似的旋转不变性,但需要付出较高的计算时间。 RIST在许多医学,科学和工业应用中可能有用。

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